Multifunctional optical lens and electronic equipment with liquid lens

Abstract

This invention discloses a multifunctional optical lens with a liquid lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a liquid lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side. The liquid lens exhibits different focal lengths depending on the applied voltage. The first lens has positive optical power, and its object side is convex. The lens of this invention employs a six-lens structure with a liquid lens. By optimizing the lens position and shape, the utilization of the liquid lens is maximized, resulting in a large image plane and a large entrance pupil diameter. Furthermore, the liquid lens enables automatic focusing, achieving high resolution at different object distances. It has a wide working object distance range, covering 1m to infinity, and exhibits high resolution and excellent imaging effects. The lens of this invention can be combined with other optical systems to form a multifunctional system.

Description

Technical Field

[0001] This invention relates to the field of multifunctional optical lens technology with liquid lenses, and more particularly to a multifunctional optical lens and electronic device with liquid lenses. Background Technology

[0002] Most existing multi-functional optical lenses that incorporate liquid lenses suffer from one or more of the following drawbacks:

[0003] Firstly, existing lenses will experience back focus shift when used at different object distances, resulting in a decrease in image quality and the need for refocusing. This is especially true for telephoto lenses, which are more sensitive to object distance, and the resolution varies greatly at different object distances.

[0004] Secondly, existing lenses with liquid lenses have a very small aperture, which results in a smaller lens aperture and poor image quality. Furthermore, the larger image area can easily block light, leading to a decrease in illumination. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a multifunctional optical lens and electronic device incorporating a liquid lens. This lens can at least solve one of the technical drawbacks mentioned in the background art.

[0006] According to one aspect of the present invention, a multifunctional optical lens with a liquid lens is provided, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a liquid lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side, wherein the liquid lens exhibits different focal lengths depending on the applied voltage; the first lens has positive optical power and its object side is convex; the second lens has positive optical power and its object side is convex; the third lens has negative optical power; the fourth lens has positive optical power, its object side is convex, and its image side is convex; the fifth lens has negative optical power, its object side is concave, and its image side is concave; and the sixth lens has positive optical power. The lens of this invention adopts a six-lens structure combined with a liquid lens. By optimizing the lens position and shape, the utilization of the liquid lens is maximized, resulting in a large image plane and a large entrance pupil diameter. Furthermore, the liquid lens enables automatic focusing, achieving high resolution at different object distances. It has a wide working object distance range, covering 1m to infinity, and provides high resolution and good imaging effect. The lens of this invention can be combined with other optical systems to form a multifunctional system.

[0007] According to another aspect of the present invention, an electronic device is provided, comprising a multifunctional optical lens with a liquid lens as described above; and an image sensor configured to receive an image formed by the multifunctional optical lens with a liquid lens. In this technical solution, the advantage of the electronic device depends on the multifunctional optical lens with a liquid lens, which will not be elaborated upon here. Attached Figure Description

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0009] Figure 1 This is a structural diagram of the optical system of the lens in Example 1.

[0010] Figure 2 This is the near-object distance MTF curve of Example 1 when the object distance is 1m.

[0011] Figure 3 This is the MTF curve of the object distance in Example 1 when the object distance is infinite.

[0012] Figure 4 This is a structural diagram of the optical system of the lens in Example 2.

[0013] Figure 5 This is the near-object distance MTF curve for Example 2 when the object distance is 1m.

[0014] Figure 6 This is the MTF curve of the object distance in Example 2 when the object distance is infinite.

[0015] Figure 7 This is a structural diagram of the optical system of the lens in Example 3.

[0016] Figure 8 This is the near-object distance MTF curve of Example 3 when the object distance is 1m.

[0017] Figure 9 This is the MTF curve of the object distance in Example 3 when the object distance is infinite.

[0018] Figure 10 This is a structural diagram of the optical system of the lens in Example 4.

[0019] Figure 11 This is the near-object distance MTF curve for Example 4 when the object distance is 1m.

[0020] Figure 12This is the MTF curve of the object distance in Example 4 when the object distance is infinite.

[0021] Figure 13 This is a schematic diagram of the structure of the electronic device of the present invention.

[0022] L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; E1, liquid lens; ST, aperture stop; IMA, imaging plane. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a multifunctional optical lens with a liquid lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a liquid lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side, wherein the liquid lens exhibits different focal lengths depending on the applied voltage;

[0025] The first lens has positive optical power, and the object side of the first lens is convex.

[0026] The second lens has positive optical power, and the object side of the second lens is convex.

[0027] This third lens has negative optical power;

[0028] The fourth lens has positive optical power, and the object side of the fourth lens is convex, and the image side of the fourth lens is convex.

[0029] The fifth lens has negative optical power, and the object side of the fifth lens is concave, and the image side of the fifth lens is concave.

[0030] The sixth lens has positive optical power.

[0031] In one embodiment, an aperture stop is provided on the object-side side of the first lens, and the first lens to the fifth lens constitute the front lens group, while the sixth lens constitutes the rear lens group. The advantages of this embodiment are: the present invention employs a front-positioned aperture stop design, and the distance between the aperture stop and the first lens is large. When the lens of the present invention is used in conjunction with other optical systems, the distance between the first lens and the aperture stop is more than 10mm, allowing the lens of the present invention to be easily connected to the light source of other optical systems such as objective lenses or mirrors, enabling the use of a multi-functional system. Furthermore, placing the liquid lens between the front and rear lens groups maximizes the light transmission of the lens.

[0032] Among them, reference Figure 1 , Figure 4 , Figure 7 , Figure 10 As shown in the figure. The first lens is labeled L1, the second lens is labeled L2, the third lens is labeled L3, the fourth lens is labeled L4, the fifth lens is labeled L5, the sixth lens is labeled L6, the liquid lens is labeled E1, the aperture is labeled ST, and the imaging plane is labeled IMA.

[0033] As one embodiment, the lens satisfies the following relationship: 1.8 < nd3 < 2.05, 1.7 < nd5 < 2.05, where nd3 is the refractive index of the third lens and nd5 is the refractive index of the fifth lens. The beneficial effect of this embodiment is that the present invention achieves high resolution and reduces the aperture of the liquid lens by combining the high refractive indices of the third and fifth lenses.

[0034] As one embodiment, the lens satisfies the following relationship: 1.1 < |fg1 / f| < 2.5, where fg1 is the focal length of the front lens group formed by the first lens to the fifth lens, and f is the focal length of the lens system. The beneficial effect of this embodiment is that the present invention maximizes the use of the liquid lens aperture, thereby increasing the light transmission of the lens.

[0035] As one embodiment, the lens satisfies the following relationship: 0.5 < |f1 / f| < 1.2, where f1 is the focal length of the first lens and f is the focal length of the lens system. The beneficial effect of this embodiment is that it achieves high resolution in the lens.

[0036] As one embodiment, the lens satisfies the following relationship: 0.3 < |f2 / f| < 0.8, where f2 is the focal length of the second lens and f is the focal length of the lens system. The beneficial effect of this embodiment is that the second lens, by satisfying the above formula, can control lens distortion.

[0037] As one embodiment, the lens satisfies the following relationship: -0.5 < f5 / f < -0.1, where f5 is the focal length of the fifth lens and f is the focal length of the lens system. The beneficial effect of this embodiment is that, by satisfying the above formula, the fifth lens allows light to enter the liquid lens with the smallest aperture, achieving high light transmission and improving relative illumination.

[0038] As one embodiment, the lens satisfies the following relationship: 0.5 < |fg1 / f6| < 2.3, where fg1 is the focal length of the front lens group formed by the first lens to the fifth lens, and f6 is the focal length of the sixth lens. The beneficial effect of this embodiment is that by satisfying the above formula, high lens resolution is achieved, and lens aperture is controlled.

[0039] As one embodiment, the lens satisfies the following relationship: vd1 > 50, where vd1 is the Abbe number of the first lens. The beneficial effect of this embodiment is that the first lens is made of a low-dispersion material, which can optimize aberrations and improve lens resolution.

[0040] As one embodiment, the lens satisfies the following relationship: vd6 > 40, where vd6 is the refractive index of the sixth lens. The beneficial effect of this embodiment is that the sixth lens is made of a low-dispersion material, which can optimize aberrations and improve lens resolution.

[0041] In summary, the beneficial effects of this invention are as follows: The lens of this invention adopts a structural design of six lenses combined with a liquid lens. By optimizing the lens position and shape, the utilization of the liquid lens is maximized, resulting in a large image plane and a large entrance pupil diameter for the lens system. Furthermore, the liquid lens enables automatic focusing, achieving high resolution at different object distances. It has a wide working object distance range, covering from 1m to infinity, resulting in high resolution and good imaging effect. The lens of this invention can be combined with other optical systems to form a multifunctional system.

[0042] The present invention will now be described in more detail with reference to the following tables. It should be noted that the following tables are merely specific embodiments of the present invention and not limiting examples.

[0043] For ease of description, in the table, surface number 1 represents the surface of the aperture stop; surface numbers 2 and 3 represent the object-side and image-side surfaces of the first lens, respectively; surface numbers 4 and 5 represent the object-side and image-side surfaces of the second lens, respectively; surface numbers 6 and 7 represent the object-side and image-side surfaces of the third lens, respectively; surface numbers 8 and 9 represent the object-side and image-side surfaces of the fourth lens, respectively; surface numbers 9 and 10 represent the object-side and image-side surfaces of the fifth lens, respectively; surface numbers 11 to 18 represent the surfaces of the various constituent materials corresponding to the liquid lens; surface number 19 is a virtual surface; and surface numbers 20 and 21 represent the object-side and image-side surfaces of the sixth lens, respectively.

[0044] Please refer to the optical structure of Example 1. Figure 1 The specific parameters of this embodiment 1 are shown in Table 1 below. In this embodiment 1, the lens focal length f=50.2mm, aperture F=5, field of view FOV=12°, target size IMH=11mm, and total length TTL=48.2mm.

[0045] Table 1 - Lens Parameter Table for Example 1

[0046]

[0047] Table 2 - Focal length arrangement of each lens in Example 1

[0048]

[0049] According to Table 1-2, the conditional expression of Embodiment 1 of the present invention can be read as follows:

[0050] (1) The refractive index of the third lens is nd3=2.00; the refractive index of the fifth lens is nd5=2.00;

[0051] (2) |fg1 / f| = 1.275;

[0052] (3) |f1 / f| = 0.952;

[0053] (4) |f2 / f| = 0.482;

[0054] (5) f5 / f = -0.167;

[0055] (6) |fg1 / f6| = 0.798;

[0056] (7) The Abbe number of the first lens is vd1=81.61, and the Abbe number of the sixth lens is vd6=52.34.

[0057] Please refer to the optical structure of Example 2. Figure 4The specific parameters of this embodiment 2 are shown in Table 3 below. In this embodiment 2, the lens focal length f=50.4mm, aperture F=5, field of view FOV=12°, target size IMH=11mm, total length TTL=49.9mm, or other parameters that the inventor deems necessary to add.

[0058] Table 3 - Lens Parameter Table for Example 2

[0059]

[0060] Table 4 - Focal length arrangement of each lens in Example 2

[0061]

[0062] According to Table 3-4, the conditional expression of Embodiment 2 of the present invention can be read as follows:

[0063] (1) The refractive index of the third lens is nd3=2.00; the refractive index of the fifth lens is nd5=2.00;

[0064] (2) |fg1 / f| = 1.275;

[0065] (3) |f1 / f| = 0.952;

[0066] (4) |f2 / f| = 0.482;

[0067] (5) f5 / f = -0.167;

[0068] (6) |fg1 / f6| = 0.798;

[0069] (7) The Abbe number of the first lens is vd1=66.90, and the Abbe number of the sixth lens is vd6=52.34.

[0070] Please refer to the optical structure of Example 3. Figure 7 The specific parameters of this embodiment 3 are shown in Table 5 below. In this embodiment 3, the lens focal length f=63.8mm, aperture F=6, field of view FOV=11.3°, target size IMH=11mm, and total length TTL=57.1mm.

[0071] Table 5 - Lens Parameter Table for Example 3

[0072]

[0073] Table 6 - Focal length arrangement of each lens in Example 3

[0074]

[0075] According to Table 5-6, the conditional expression of Embodiment 3 of the present invention can be read as follows:

[0076] (1) The refractive index of the third lens is nd3=2.00; the refractive index of the fifth lens is nd5=2.00;

[0077] (2) |fg1 / f| = 1.454;

[0078] (3) |f1 / f| = 0.506;

[0079] (4) |f2 / f| = 0.552;

[0080] (5) f5 / f = -0.130;

[0081] (6) |fg1 / f6| = 1.474;

[0082] (7) The Abbe number of the first lens is vd1=70.40, and the Abbe number of the sixth lens is vd6=52.34.

[0083] Please refer to the optical structure of Example 4. Figure 10 The specific parameters of this embodiment 4 are shown in Table 7 below. In this embodiment 4, the lens focal length f=48mm, aperture F=4.8, field of view FOV=12.5°, target size IMH=11mm, and total length TTL=52.1mm.

[0084] Table 7 - Lens Parameter Table for Example 4

[0085]

[0086] Table 8 - Focal length arrangement of each lens in Example 4

[0087]

[0088] According to Table 5-6, the conditional expression of Embodiment 3 of the present invention can be read as follows:

[0089] (1) The refractive index of the third lens is nd3=1.95; the refractive index of the fifth lens is nd5=1.93;

[0090] (2) |fg1 / f| = 1.806;

[0091] (3) |f1 / f| = 0.800;

[0092] (4) |f2 / f| = 0.644;

[0093] (5) f5 / f = -0.154;

[0094] (6) |fg1 / f6| = 2.318;

[0095] (7) The Abbe number of the first lens is vd1 = 76.05 and the Abbe number of the sixth lens is vd6 = 52.34.

[0096] The following is an explanation of the various figures in Examples 1 to 4:

[0097] Figure 1 This is a structural diagram of the optical system of the lens in Embodiment 1. As can be seen from the diagram: the object-side surface of the first lens is convex, and the image-side surface of the first lens is convex; the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; the object-side surface of the third lens is convex, and the image-side surface of the third lens is concave; the object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is convex; the object-side surface of the fifth lens is concave, and the image-side surface of the fifth lens is concave; the object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is concave.

[0098] Figure 2 This is the MTF curve of Example 1 at a near-object distance of 1m. The horizontal axis represents frequency, in line pairs. The vertical axis represents MTF value, with no unit. As can be seen from the graph, the MTF curve is highly concentrated in the wavelength range of 0.434µm-0.656µm. At 125Lp / mm, the MTF for most of the field of view is concentrated around 0.4, indicating that the lens has extremely high resolution and excellent imaging capabilities.

[0099] Figure 3 This is the MTF curve of Example 1 at infinity. The horizontal axis represents frequency in line pairs, and the vertical axis represents the MTF value (units not specified). The graph shows that the MTF curve is highly concentrated in the wavelength range of 0.434µm to 0.656µm. At 125 Lp / mm, the MTF for most of the field of view is concentrated around 0.4, indicating that the lens has extremely high resolution and excellent imaging.

[0100] Figure 4 This is a structural diagram of the optical system of the lens in Embodiment 2. As can be seen from the diagram: the object-side surface of the first lens is convex, and the image-side surface of the first lens is convex; the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; the object-side surface of the third lens is convex, and the image-side surface of the third lens is concave; the object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is convex; the object-side surface of the fifth lens is concave, and the image-side surface of the fifth lens is concave; the object-side surface of the sixth lens is concave, and the image-side surface of the sixth lens is convex.

[0101] Figure 5This is the MTF curve for near-object distance at a distance of 1m in Example 2. The horizontal axis represents frequency, in line pairs. The vertical axis represents MTF value, with no unit. As can be seen from the graph, the MTF curve is highly concentrated in the wavelength range of 0.434µm-0.656µm. At 125Lp / mm, the MTF for most of the field of view is concentrated around 0.4, indicating that the lens has extremely high resolution and excellent imaging capabilities.

[0102] Figure 6 This is the MTF curve for Example 2 at infinity. The horizontal axis represents frequency in line pairs, and the vertical axis represents the MTF value (units not specified). The graph shows that the MTF curve is highly concentrated in the wavelength range of 0.434µm-0.656µm. At 125 Lp / mm, the MTF for most of the field of view is around 0.4, indicating that the lens has extremely high resolution and excellent imaging capabilities.

[0103] Figure 7 This is a structural diagram of the optical system of the lens in Embodiment 3. As can be seen from the diagram: the object-side surface of the first lens is convex, and the image-side surface of the first lens is convex; the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; the object-side surface of the third lens is concave, and the image-side surface of the third lens is concave; the object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is convex; the object-side surface of the fifth lens is concave, and the image-side surface of the fifth lens is concave; the object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is convex.

[0104] Figure 8 This is the MTF curve for near-object distance in Example 3 at an object distance of 1m. The horizontal axis represents frequency, in line pairs. The vertical axis represents MTF value, with no unit. As can be seen from the graph, the MTF curve is highly concentrated in the wavelength range of 0.434µm-0.656µm. At 125Lp / mm, the MTF for most of the field of view is concentrated around 0.4, indicating that the lens has extremely high resolution and excellent imaging capabilities.

[0105] Figure 9 This is the MTF curve for Example 3 at infinity. The horizontal axis represents frequency in line pairs, and the vertical axis represents the MTF value (units not specified). The graph shows that the MTF curve is highly concentrated in the wavelength range of 0.434µm-0.656µm. At 125 Lp / mm, the MTF for most of the field of view is around 0.4, indicating that the lens has extremely high resolution and excellent imaging capabilities.

[0106] Figure 10This is a structural diagram of the optical system of the lens in Embodiment 4. As can be seen from the diagram: the object-side surface of the first lens is convex, and the image-side surface of the first lens is flat; the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; the object-side surface of the third lens is concave, and the image-side surface of the third lens is concave; the object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is convex; the object-side surface of the fifth lens is concave, and the image-side surface of the fifth lens is concave; the object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is concave.

[0107] Figure 11 This is the MTF curve for near-object distance in Example 4 at an object distance of 1m. The horizontal axis represents frequency, in line pairs. The vertical axis represents MTF value, with no unit. The graph shows that the MTF curve is highly concentrated in the wavelength range of 0.434µm-0.656µm. At 125Lp / mm, the MTF for most of the field of view is concentrated around 0.4, indicating that the lens has extremely high resolution and excellent imaging.

[0108] Figure 12 This is the MTF curve for Example 4 at infinity. The horizontal axis represents frequency in line pairs, and the vertical axis represents the MTF value (units not specified). The graph shows that the MTF curve is highly concentrated in the wavelength range of 0.434µm-0.656µm. At 125 Lp / mm, the MTF for most of the field of view is around 0.4, indicating that the lens has extremely high resolution and excellent imaging capabilities.

[0109] On the other hand, now refer to Figure 13 A schematic diagram of the structure of the electronic device A according to the present invention will be given. Figure 13 This is a schematic diagram of an electronic device (camera) for a photographic optical system, which is one of the multifunctional optical lenses with liquid lenses according to Examples 1 to 4.

[0110] exist Figure 13 In the figures, reference numeral A2 indicates the main body of the electronic device, and reference numeral A1 indicates any of the camera optical systems (interchangeable lenses) including the multifunctional optical lenses with liquid lenses according to Examples 1 to 3. Reference numeral A3 indicates an image sensor (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor, which is built into the camera body A2 and receives light (the optical image formed by the camera optical system A1) from the camera optical system A1 and performs photoelectric conversion.

[0111] By using a multifunctional optical lens with a liquid lens according to any one of Examples 1 to 4 in electronic devices such as digital still cameras, electronic devices with high optical performance can be obtained.

[0112] Each example can provide electronic devices with high optical performance.

[0113] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims will be given the broadest interpretation to cover all such modifications and equivalent structures and functions.

Claims

1. A multifunctional optical lens equipped with a liquid lens, characterized in that, It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a liquid lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side, wherein the liquid lens exhibits different focal lengths depending on the applied voltage; The first lens has positive optical power, and the object side of the first lens is convex. The second lens has positive optical power, and the object side of the second lens is convex. This third lens has negative optical power; The fourth lens has positive optical power, and the object side of the fourth lens is convex, and the image side of the fourth lens is convex. The fifth lens has negative optical power, and the object side of the fifth lens is concave, and the image side of the fifth lens is concave. The sixth lens has positive optical power.

2. A multifunctional optical lens with a liquid lens as described in claim 1, characterized in that, The first lens has an aperture stop facing the object side, and the first lens to the fifth lens constitute the front lens group, and the sixth lens constitutes the rear lens group.

3. A multifunctional optical lens with a liquid lens as described in claim 1, characterized in that, The lens satisfies the following relationship: 1.8<nd3<2.05, 1.7<nd5<2.05 Wherein, nd3 is the refractive index of the third lens, and nd5 is the refractive index of the fifth lens.

4. A multifunctional optical lens with a liquid lens as described in claim 2, characterized in that, The lens satisfies the following relationship: 1.1 < |fg1 / f| < 2.5 Where fg1 is the focal length of the front lens group consisting of the first lens to the fifth lens, and f is the focal length of the lens system.

5. A multifunctional optical lens with a liquid lens as described in claim 1, characterized in that, The lens satisfies the following relationship: 0.5 < |f1 / f| < 1.2 Where f1 is the focal length of the first lens, and f is the focal length of the lens system.

6. A multifunctional optical lens with a liquid lens as described in claim 1, characterized in that, The lens satisfies the following relationship: 0.3 < |f² / f| < 0.8 Where f2 is the focal length of the second lens, and f is the focal length of the lens system.

7. A multifunctional optical lens with a liquid lens as described in claim 1, characterized in that, The lens satisfies the following relationship: -0.5 < f5 / f < -0.1 Where f5 is the focal length of the fifth lens, and f is the focal length of the lens system.

8. A multifunctional optical lens with a liquid lens as described in claim 2, characterized in that, The lens satisfies the following relationship: 0.5 < |fg1 / f6| < 2.3 Wherein, fg1 is the focal length of the first lens to the fifth lens forming the front lens group, and f6 is the focal length of the sixth lens.

9. A multifunctional optical lens with a liquid lens as described in claim 1, characterized in that, The lens satisfies the following relationship: vd1 > 50, vd6 > 40 Wherein, vd1 is the Abbe number of the first lens, and vd6 is the refractive index of the sixth lens.

10. An electronic device, characterized in that, A multifunctional optical lens with a liquid lens according to any one of claims 1-9; and An image sensor configured to receive images formed by the multifunctional optical lens coupled with a liquid lens.

Images